Wikinotes is a wiki-based note taking application for your Mac that you can take with you via your iPod.

Want to take your notes with you? No problem. Connect your iPod and there you go. Just one click and your Wiki is on your iPod. Just look under Notes and find a folder named like the exported Document. There are all your pages. They are linked up and split in 4-kb portions, so your iPod understands them.